NP, not being a forum pedant, just wanted to know if the box murders MPG (seems like it doesn't) .
Regarding the choppy gear changes on a +1 boost setting, I suspect the car is trying too hard to hit the expected boost targets.
I've seen this from experience tuning other turbo cars: The ECU is like why the feck aren't I hitting my boost target and slaps the wastegate fully
open,
the boost or load target then gets overshot through the gear and it dumps boost at the top of the gear just as it selects the next (moving from high RPM, lower wastegate duty to medium RPM full/high wastegate duty again)
The other thing that you can see happening in piggybacks that allow logging is the boost target is just too high and never gets hit (more of a problem in 1st and 2nd as there isn't time to reach the target boost level, can also happen on really hot days when the IC is red hot too) this really makes for a stuttery drive and works the turbo v.hard.
Ideally I would like BMS to hurry up and release the JB4 for our engines because it has code reading and logging features but its been in beta for a very long time. I'm doubtful they will have anything stable to market in the next 12 months...